APRILIA RSV 1000 R FACTORY Workshop Manual page 298

ELECTRICAL SYSTEM
17 FUEL PUMP
absorption 3.9 A
18 FUEL RESERVE SENSOR
The vehicle does not have a fuel gauge but rather a simple
led which turns on when the fuel level is below 0.98 gal (3.7
liters): the sensor starts conducting (and the led turns on) 30
seconds after it is no longer wetted by fuel.
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RSV 1000 R - RSV 1000 R FACTORY